An attempt to enhance the afterglow luminescence of NIR light emitting long persistent phosphor ZnGaGeO:Cr by Pr co-doping.

In this study we have focused on the improvement of luminescence intensity and the long afterglow luminescence of Cr doped ZnGaGeO long persistent phosphor by adding an appropriate amount of Pr ions in proportion with Ga concentration. We have successfully developed a series of long persistent ZnGaCrPrGeO (where x = 0, 0.04 and y = 0, 0.